Insight by Science
Astronauts in orbit are weightless because they follow spacetime geodesics, and their straight motion through curved spacetime appears as a helical orbit when projected into space and time around Earth.
Want more like this?
Every card on Korva is an insight someone saved from a podcast or video they loved.
More from @science's Picks
See all →Large amounts of moondust raining through the atmosphere would convert kinetic energy into heat—potentially heating and even boiling surface waters—while persistent ring shadows and volcanic/meteoric aerosols would reflect sunlight and trigger rapid cooling, so the net climate effect depends on the balance and timing of heating versus sunlight blockage.
Plants that produce caffeine suffer less insect damage because caffeine is toxic to many insects, so caffeine-producing individuals are more likely to survive and reproduce than neighboring plants without it.